JPH0727021Y2 - Thread trimming device for lockstitch sewing machine - Google Patents

Thread trimming device for lockstitch sewing machine

Info

Publication number
JPH0727021Y2
JPH0727021Y2 JP11453789U JP11453789U JPH0727021Y2 JP H0727021 Y2 JPH0727021 Y2 JP H0727021Y2 JP 11453789 U JP11453789 U JP 11453789U JP 11453789 U JP11453789 U JP 11453789U JP H0727021 Y2 JPH0727021 Y2 JP H0727021Y2
Authority
JP
Japan
Prior art keywords
thread
needle
movable blade
sewing machine
upper thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP11453789U
Other languages
Japanese (ja)
Other versions
JPH0355078U (en
Inventor
寿士 久保田
甲 吾郷
Original Assignee
ジューキ株式会社
株式会社中島製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ジューキ株式会社, 株式会社中島製作所 filed Critical ジューキ株式会社
Priority to JP11453789U priority Critical patent/JPH0727021Y2/en
Publication of JPH0355078U publication Critical patent/JPH0355078U/ja
Application granted granted Critical
Publication of JPH0727021Y2 publication Critical patent/JPH0727021Y2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【考案の詳細な説明】 [産業上の利用分野] この考案は、本縫いミシンにおいて、上糸及び下糸を針
板下方で切断するようにした糸切り装置に関するもので
ある。
DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a thread trimming device for cutting an upper thread and a lower thread below a needle plate in a lockstitch sewing machine.

[従来の技術] 現在、本縫いミシンには、縫製終了後などにおいて自動
的に糸切り動作を行なう糸切り装置が設けられている。
この糸切り装置としては、所定の糸切り指令により針及
びミシン釜が一縫製動作を行い、その間に可動刃が針板
とミシン釜との間で水平移動して、ミシン釜を通過する
上糸ループと下糸とを捕捉し、固定刃との間で切断する
ものが一般に知られている。通常、このような糸切り装
置には、可動刃の往復動作の初期位置において、可動刃
の刃部と接する板ばねが設けられており、切断された糸
の端部を、その板ばねと可動刃との間で挟持することに
より、次の縫製において、下糸を上糸ループと確実に結
節させ得るようになっている。
[Prior Art] Currently, a lockstitch sewing machine is provided with a thread trimming device that automatically performs a thread trimming operation after sewing is completed.
As this thread trimming device, the needle and the sewing machine hook perform a single sewing operation in response to a predetermined thread trimming command, and the movable blade moves horizontally between the needle plate and the sewing machine hook during that time, and the upper thread that passes through the sewing machine hook. It is generally known that a loop and a bobbin thread are caught and cut between a fixed blade. Usually, such a thread trimming device is provided with a leaf spring which is in contact with the blade portion of the movable blade at the initial position of the reciprocating movement of the movable blade, and the end portion of the cut yarn is movable with the leaf spring. By sandwiching the needle thread with the blade, the lower thread can be reliably knotted with the upper thread loop in the next sewing.

[考案が解決しようとする課題] しかしながら、上記従来の糸切り装置にあっては、次の
ような問題があった。
[Problems to be Solved by the Invention] However, the above-described conventional thread cutting device has the following problems.

すなわち、(イ)上糸及び下糸は、可動刃における同一
箇所、つまり可動刃先端部に設けられたフック状の糸捕
捉部により捕捉され、固定刃との間で同時に同一箇所で
切断されることとなる。従って、下糸だけではなく、針
に連なる上糸(以下、この糸を針側上糸と称する。)も
その切断端部を板ばねによって保持されることとなる。
このため、縫製動作終了後、縫製物の取り出しを行う
と、針に連なる上糸が縫製物から抜け出しにくくなると
共に、縫製物と共に、上糸供給源から糸が繰り出されて
いまい、次の縫製作業に支障を来たす。
That is, (a) the upper thread and the lower thread are caught at the same position on the movable blade, that is, by the hook-shaped thread catching portion provided at the tip of the movable blade, and cut at the same position with the fixed blade at the same time. It will be. Therefore, not only the lower thread but also the upper thread (hereinafter, this thread is referred to as the needle-side upper thread) connected to the needle has its cut end held by the leaf spring.
Therefore, if the sewn product is taken out after the sewing operation is completed, the needle thread connected to the needle will not easily come out of the sewn product, and the thread will not be fed from the needle thread supply source together with the sewn product. Interfere with.

(ロ) 縫製物が針板における針落上に存在しない状態
で糸切り動作を行った場合(以下、この糸切り動作を落
し切りと称す。)、針板付近における上ループの挙動が
不安定になるため、切断後板ばねによって保持される針
側上糸の切断端部から針の上糸挿通孔までの糸長が不規
則となり、場合によってはその糸長不足により次の縫製
時において上糸が針の挿通孔から抜脱してしまい、縫製
不良が発生する。
(B) When the thread trimming operation is performed when the sewing product is not on the needle drop on the needle plate (hereinafter, this thread trimming operation is referred to as drop trimming), the behavior of the upper loop near the needle plate is unstable. Therefore, the thread length from the cutting end of the needle side needle thread held by the leaf spring after cutting to the needle thread insertion hole of the needle becomes irregular, and in some cases due to the lack of thread length, the thread length is increased during the next sewing. The thread may slip out of the needle insertion hole, resulting in poor sewing.

(ハ) 切断時において可動刃によって捕捉された糸に
は、ある程度の張力がかかっていることが望ましいが、
上糸はミシン釜を通過する際に上糸供給源から針板下方
へ繰り出されるため、切断時において張力が発生しにく
く、良好な切れ味が得られない、などといった問題があ
った。
(C) It is desirable that a certain amount of tension be applied to the thread captured by the movable blade during cutting,
When the needle thread passes through the sewing machine hook, the needle thread is fed out from the needle thread supply source to the lower side of the needle plate, so that tension is unlikely to be generated during cutting, and good sharpness cannot be obtained.

この考案は上記問題に着目してなされたもので、糸切り
後の縫製物の取り出しにおいて、縫製物から針側上糸を
スムーズに抜脱させることができると共に、次の縫製動
作開始時における針からの上糸の抜け出しを防止でき、
かつ上糸に対して良好な切れ味が得られる本縫いミシン
の糸切り装置の提供を目的とする。
This invention was made in view of the above problems, and when taking out the sewn product after thread cutting, the needle side upper thread can be smoothly pulled out from the sewn product, and the needle at the start of the next sewing operation is also performed. It is possible to prevent the upper thread from coming out of the
Moreover, it is an object of the present invention to provide a thread trimming device for a lockstitch sewing machine that can obtain a good sharpness for the upper thread.

[課題を解決するための手段] この考案は、所定の糸切り指令に応じて可動刃を針落延
長線を横切って一往復動させると共に、本縫いミシンの
針及びミシン釜による一縫製動作を行わせることによ
り、下糸と上糸ループとを可動刃にて捕捉させ、両糸を
可動刃とこれに摺接する固定刃との間で切断すると同時
に、切断した両糸端を可動刃と板ばねとの間で挟持する
ようにした本縫いミシンの糸切り装置において、前記ミ
シン釜内に装着されるボビンケースの上糸ループ接触面
に、上糸ループとの非接触部を形成すると共に、先端部
に前記非接触部に嵌入可能なフック状の糸掛け部を有す
る上糸引出し部材を前記可動刃の往復動作に連動してミ
シン釜の側方から前記非接触部との嵌入位置に亘って往
復動させるようにし、かつ、前記可動刃の往復動作終了
に同期して糸払い部材を前記可動刃から針に至る上糸経
路を横切るよう移動させるようにしたものである。
[Means for Solving the Problem] The present invention moves a movable blade back and forth once across a needle drop extension line in response to a predetermined thread trimming command, and also performs one sewing operation by a needle of a lock stitch sewing machine and a sewing machine hook. By doing so, the bobbin thread and the upper thread loop are captured by the movable blade, and both threads are cut between the movable blade and the fixed blade that is in sliding contact with the movable blade, and at the same time, the cut both thread ends are moved to the movable blade and the plate. In a thread trimming device for a lockstitch sewing machine, which is sandwiched between a spring and a spring, a non-contact portion with a needle thread loop is formed on a needle thread loop contact surface of a bobbin case mounted in the sewing machine hook, An upper thread withdrawing member having a hook-shaped thread hooking portion that can be fitted into the non-contact portion at a tip end thereof is interlocked with the reciprocating motion of the movable blade and extends from a side of the sewing machine hook to a fitting position with the non-contact portion. Reciprocating motion and moving the movable blade forward and backward. In synchronism with the end of the returning operation, the thread wiping member is moved across the upper thread path from the movable blade to the needle.

[作用] この考案において、上糸引出し部材は、可動刃の往復動
作に連動して往復動を行い、ボビンケース前面を通過す
る上糸ループを捕捉し、ミシン釜の側方へ引き出す。こ
のため、上糸ループは可動刃と上糸引き出し部材にて捕
捉されることとなり、切断時において、可動刃から針に
至る上糸経路は上糸引き出し部材により屈曲することと
なる。従って、従来の上糸引き出し部材を具備しない装
置に比べて上糸経路長を増加させることができ、落し切
りを行った場合にも上糸が針の上糸挿通孔から抜脱する
ことはない。また、この上糸引出し部材の上糸引き出し
動作により上糸には張力が発生するため、上糸に対応す
る切れ味は極めて良好なものとなる。
[Operation] In this invention, the needle thread withdrawing member reciprocates in conjunction with the reciprocating movement of the movable blade to capture the needle thread loop passing through the front surface of the bobbin case and pull it out to the side of the sewing machine hook. Therefore, the upper thread loop is captured by the movable blade and the upper thread drawing member, and the upper thread path from the movable blade to the needle is bent by the upper thread drawing member at the time of cutting. Therefore, it is possible to increase the length of the upper thread path as compared with the conventional device which does not include the upper thread drawing member, and the upper thread does not come out from the needle thread insertion hole of the needle even when the needle thread is cut off. . Further, since tension is generated in the upper thread by the upper thread drawing operation of the upper thread drawing member, the sharpness corresponding to the upper thread becomes extremely good.

さらに、針側上糸の切断端部は、切断動作と同時に一旦
板ばねによって保持されるが、その後直ちに糸払い部材
が可動刃から針に至る上糸経路を横切って移動し、上糸
引出し部材の糸掛け部にて引き出されている針側上糸を
引き払うため、同糸の切断端部は板ばねから引き抜か
れ、開放状態となる。このため、縫製物の取り出しに際
し、針側上糸はスムーズに縫製物から抜け出し、不必要
な上糸が上糸供給源から繰り出されることはなくなり、
次の縫製動作を円滑に開始することができる。
Further, the cut end of the needle side upper thread is once held by the leaf spring at the same time as the cutting operation, but immediately thereafter, the thread wiping member moves across the upper thread path from the movable blade to the needle, and the upper thread drawing member In order to pull off the needle side upper thread pulled out by the thread hooking section, the cut end portion of the thread is pulled out from the leaf spring and becomes in the open state. Therefore, when the sewn product is taken out, the needle-side upper thread does not come out of the sewn product smoothly and unnecessary upper thread is not fed out from the upper thread supply source.
The next sewing operation can be started smoothly.

[考案の実施例] 以下、この考案の一実施例を図面と共に説明する。[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

第1図ないし第3図において、1は針板Bの下方に設け
られた周知のミシン釜で、ミシン機枠に係止される内釜
2と、この内釜2の周面に回動可能に嵌合する外釜3と
より成り、前記内釜2には、内部に下糸ボビンを収納し
たボビンケース4が装着されている。また、このボビン
ケース4の前面には、上糸ループとの非接触部としての
長溝4aが形成されている。
In FIGS. 1 to 3, reference numeral 1 denotes a known sewing machine hook provided below the needle plate B, which is rotatable with respect to an inner hook 2 which is locked to the machine frame of the sewing machine and a peripheral surface of the inner hook 2. A bobbin case 4 having a lower thread bobbin accommodated therein is attached to the inner hook 2. A long groove 4a is formed on the front surface of the bobbin case 4 as a non-contact portion with the upper thread loop.

6はミシンベッド下面に固定された糸切り土台、7はこ
の糸切り土台6に形成されたガイド溝6aに移動可能に嵌
合させた移動台である。この移動台7は、常には第2図
に示す初期位置にあり、所定の糸切り指令が入力される
と、リンク部材5をはじめとする図外の連動機構を介し
てミシン下軸に連結され、ミシン下軸がミシン上軸と共
に位置回転する間に、その回転力を駆動力とする前記連
動機構によりガイド溝6aに沿って一往復動するようにな
っている。また、8は前記移動台7の上面にねじ9によ
って固定した板状の可動刃で、その先端部にはフック状
の糸捕捉部8aが形成され、さらにその糸捕捉部8aの上面
には刃部8bが形成されている。10は前記糸切り土台6の
前端部上面にねじ11によって固着した板状の固定刃であ
り、その先端部には前記可動刃8の刃部8bと接合する刃
部10aが形成されている。12は後端部を前記移動台7の
下面にねじ13により固定した板ばねであり、その前端部
12aは前記可動刃8の下面に圧接している。
Reference numeral 6 denotes a thread cutting base fixed to the lower surface of the sewing machine bed, and 7 denotes a moving base movably fitted in a guide groove 6a formed in the thread cutting base 6. This moving base 7 is always in the initial position shown in FIG. 2, and when a predetermined thread cutting command is input, it is connected to the lower shaft of the sewing machine through an interlocking mechanism such as the link member 5 (not shown). While the lower shaft of the sewing machine is positionally rotated together with the upper shaft of the sewing machine, the reciprocating motion is performed along the guide groove 6a by the interlocking mechanism having the rotational force as a driving force. Further, 8 is a plate-shaped movable blade fixed to the upper surface of the moving table 7 with a screw 9, and a hook-shaped thread catching portion 8a is formed at the tip thereof, and further, a blade is provided on the upper surface of the thread catching portion 8a. The portion 8b is formed. Reference numeral 10 is a plate-shaped fixed blade fixed to the upper surface of the front end portion of the thread cutting base 6 with a screw 11, and a blade portion 10a joined to the blade portion 8b of the movable blade 8 is formed at the tip portion thereof. Reference numeral 12 is a leaf spring whose rear end is fixed to the lower surface of the movable table 7 with a screw 13, and its front end is shown.
12a is in pressure contact with the lower surface of the movable blade 8.

14は前記移動台7の下面にねじ15によって固定したピッ
カ移動台、16はこのピッカ移動台14の下面にねじ15によ
って固定したピッカであり、その先端部には前記ボビン
ケース4の長溝4aに嵌入可能な糸掛け部16aが形成され
ている。
Reference numeral 14 is a picker moving base fixed to the lower surface of the moving base 7 with a screw 15, and 16 is a picker fixed to the lower surface of the picker moving base 14 with a screw 15. The tip end of the picker is fixed to the long groove 4a of the bobbin case 4. A thread hooking portion 16a that can be inserted is formed.

また、18は支持台19によってミシン機枠に取り付けられ
たロータリーソレノイドである。このロータリーソレノ
イド18は、前記可動刃8の往復動作終了に同期して、ソ
レノイド軸18aが一揺動回転するようになっている。20
は前記ソレノイド軸18aに一端部を固定して成る揺動
腕、21はこの揺動腕20の他端部に固着したワイパ(糸払
い部材)であり、前記ソレノイド軸18aの揺動回転に伴
って揺動腕20と一体に揺動回転し、その先端部21aが前
記ピッカ16とミシン釜1との間において、可動刃8から
針Nに至る上糸経路を横切るようになっている。
A rotary solenoid 18 is attached to the machine frame by a support 19. In this rotary solenoid 18, the solenoid shaft 18a makes one swing rotation in synchronization with the end of the reciprocating motion of the movable blade 8. 20
Is a swing arm whose one end is fixed to the solenoid shaft 18a, and 21 is a wiper (thread wiper member) fixed to the other end of the swing arm 20. And swings integrally with the swing arm 20, and its tip 21a crosses the needle thread path from the movable blade 8 to the needle N between the picker 16 and the sewing machine hook 1.

以上の構成に基づき、次に作用に説明する。Next, the operation will be described based on the above configuration.

糸切り指令入力前の初期状態において、移動台7は後方
(第2図中右方)に位置しており、可動刃8の糸掛け部
8aは固定刃10と板ばね12との接触位置、すなわち、針落
位置の延長線Lから退避した位置に保持されている。こ
の時ピッカ16は、その糸掛け部8aがミシン釜1の側方に
位置しており、またワイパ21はその先端部21aがピッカ1
6の移動経路から退避している。この状態で縫製動作は
行なわれるため、可動刃8及びピッカ16が針Nやミシン
釜1の縫製動作を妨げることはない。
In the initial state before inputting the thread trimming command, the movable table 7 is located rearward (rightward in FIG. 2), and the thread hooking portion of the movable blade 8
8a is held at a contact position between the fixed blade 10 and the leaf spring 12, that is, at a position retracted from the extension line L of the needle drop position. At this time, the picker 16 has its thread hooking portion 8a located on the side of the sewing machine hook 1, and the wiper 21 has its tip portion 21a at the picker 1a.
Evacuated from route 6 Since the sewing operation is performed in this state, the movable blade 8 and the picker 16 do not interfere with the sewing operation of the needle N and the sewing machine hook 1.

ここでいま、縫製動作の終了に伴ない糸切り指令が入力
されると、ミシン上軸及び下軸1回転し、針N及び外釜
3により一縫製動作が行われると共に、移動台7がガイ
ド溝6aに沿って一往復動し、可動刃8及びピッカ16を往
復動させる。この時、可動刃8及びピッカ16は第4図
(a)〜(f)に示すようにして往復動作を行う。
Here, when a thread trimming command is input along with the end of the sewing operation, the sewing machine performs one rotation of the upper shaft and the lower shaft, one sewing operation is performed by the needle N and the outer hook 3, and the movable table 7 is guided. The movable blade 8 and the picker 16 are reciprocated by reciprocating once along the groove 6a. At this time, the movable blade 8 and the picker 16 reciprocate as shown in FIGS. 4 (a) to 4 (f).

すなわち、可動刃8は第4図(a)に示す初期位置か
ら、同図(b)に示すように水平移動して行き、針板B
とミシン釜1との間を通過して針落位置の延長線Lを横
切る。この時、可動刃8の先端部は、外釜3の剣先3aに
より捕捉されて内釜2を通過しつつある上糸ループI1中
に入り込み、同ループI1の2本のループ糸I11,I12を第
4図(c)に示すように選り分ける。その後、可動刃8
は最往動位置に達して復動を開始し、若干復動したとこ
ろで、先に選り分けたループ糸I11と下糸I2とを糸捕捉
部8aにて捕捉し、両糸I11,I2を引き出しながら初期位置
へ向けて復動する(第4図(d)参照)。そして可動刃
8が初期位置に達する直前で、捕捉された両糸I11,I2
は、可動刃8の刃部8bと固定刃10の刃部10aとの間で切
断される。これにより、下糸I2はミシン釜1に連なる部
分(釜側下糸)I2aと縫製物に連なる部分(縫目側下
糸)I2bとに分断され、上糸I1は針Nに連通する部分
(針側上糸)I1aと縫製物に連なる部分(縫目側上糸)I
1bとに分段される。そして、可動刃8が完全に初期位置
へ復帰した時点で、針側上糸I1a及び釜側下糸I2aの各切
断端部が板ばね16と可動刃8との間で挟持される。
That is, the movable blade 8 moves horizontally from the initial position shown in FIG. 4A as shown in FIG.
And the sewing machine hook 1 to cross the extension line L at the needle drop position. At this time, the tip of the movable blade 8 is caught by the sword tip 3a of the outer hook 3 and enters the upper thread loop I1 passing through the inner hook 2, and the two loop threads I1 1 and I1 of the loop I1 are caught. Select 2 as shown in Fig. 4 (c). After that, the movable blade 8
Reaches the most forward movement position and starts returning, and when returning a little, the previously selected loop yarn I11 and bobbin yarn I2 are caught by the yarn catching portion 8a, and both yarns I11 and I2 are pulled out. It moves back toward the initial position (see FIG. 4 (d)). Immediately before the movable blade 8 reaches the initial position, the captured both threads I11, I2
Is cut between the blade portion 8b of the movable blade 8 and the blade portion 10a of the fixed blade 10. As a result, the bobbin thread I2 is divided into a portion connected to the sewing machine hook 1 (hook side lower thread) I2a and a part connected to the sewn product (seam side bobbin thread) I2b, and the upper thread I1 is connected to the needle N ( Needle side upper thread) I1a and the part that continues to the sewn product (Stitch side upper thread) I
Divided into 1b. When the movable blade 8 is completely returned to the initial position, the cut ends of the needle side upper thread I1a and the shuttle side lower thread I2a are clamped between the leaf spring 16 and the movable blade 8.

一方、ピッカ16は可動刃8と共に第4図(a)示す初期
位置から往動動作を開始し、所定距離移動した時点で第
4図(b)に示すように、糸掛け部16aの端部がボビン
ケース4の前面に形成された長溝4aに嵌入し、以後、こ
の長溝4aに沿って往動する。すると、内釜2を通過する
上糸のうち、ボビンケース4の前面側を移動するループ
糸I11が前記糸掛け部16aに当接して係止され(第4図
(c)参照)、同糸I11は内釜2から抜け出した時点
で、第4図(d)に示すように糸掛け部16aにより捕捉
される。そして、ピッカ16は上糸ループI1を保持しつつ
可動刃8と共に復動し、可動刃8が糸を切断した時点
で、上糸ループI1をミシン釜1の側方へ引き出す(第4
図(e)参照)。その結果、可動刃8から針Nに至る上
糸経路は第5図に示すように、前記ピッカ16の糸掛け部
16aにて屈曲する経路となり、従来のようにピッカ16を
具備していないものにおける経路(第5図中、一点鎖線
にて示す)に比べて経路長を増加することができる。こ
のため、仮え縫製物を取り除いた状態で糸切り動作を行
ったとしても(落し切りを行ったとしても)針Nの上糸
挿通孔Naから上糸切断端部までの長さは、必要十分な長
さに維持されるため、次の縫製において、上糸I1aが針
Nの上糸挿通孔Naより抜脱することはない。
On the other hand, the picker 16 starts the forward movement together with the movable blade 8 from the initial position shown in FIG. 4 (a), and when it moves a predetermined distance, as shown in FIG. 4 (b), as shown in FIG. Fits into the long groove 4a formed on the front surface of the bobbin case 4, and thereafter moves forward along the long groove 4a. Then, among the upper yarns passing through the inner hook 2, the loop yarn I11 that moves on the front surface side of the bobbin case 4 comes into contact with and is locked by the yarn hooking portion 16a (see FIG. 4 (c)). When I11 comes out of the inner hook 2, it is caught by the thread hooking portion 16a as shown in FIG. 4 (d). Then, the picker 16 moves back together with the movable blade 8 while holding the upper thread loop I1, and when the movable blade 8 cuts the thread, the upper thread loop I1 is pulled out to the side of the sewing machine hook 1 (fourth
(See FIG. (E)). As a result, the upper thread path from the movable blade 8 to the needle N is, as shown in FIG.
The path becomes a bend at 16a, and the path length can be increased as compared with the conventional path without the picker 16 (shown by the one-dot chain line in FIG. 5). Therefore, the length from the needle thread insertion hole Na of the needle N to the needle thread cutting end portion is required even if the thread trimming operation is performed with the temporary sewing material removed (even if the trimming is performed). Since the length is maintained at a sufficient length, the upper thread I1a will not be pulled out from the upper thread insertion hole Na of the needle N in the next sewing.

また、上述のようにピッカ16によって上糸ループI1の経
路長を増大させることにより、切断時において上糸ルー
プには張力が発生するため、良好な切れ味を得ることが
できる。
Further, by increasing the path length of the upper thread loop I1 by the picker 16 as described above, tension is generated in the upper thread loop at the time of cutting, so that good sharpness can be obtained.

そして、切断動作と同時に針側上糸I1aの切断端部は、
釜側下糸I2aと共に板ばね12によって一旦保持される。
しかし、可動刃8の復動動作が終了すると、これに同期
してロータリーソレノイド18のソレノイド軸18aが第6
図中矢符A方向へ回転し、ワイパ21が回転してその先端
部21aがピッカ16から針Nに至る上糸経路を横切るた
め、針側上糸I1aはこのワイパ先端部21aに捕捉されて引
き出される。その結果、板ばね12により保持された針側
上糸I1aの切断端部は、ワイパ21の引き出し動作により
板ばね12から引き払われ、第6図の一点鎖線にて示すよ
うに開放状態となる。このため、縫製物Wを取り出した
場合、針側上糸I1aはスムーズに縫製物Wから抜脱す
る。従って、その取り出しに際し、上糸が上糸供給源か
ら不必要に繰り出されることはなくなり、次の縫製動作
が妨げられることはない。なお、上糸I1aを引き払った
後、ワイパ21はロータリーソレノイド18によって初期位
置へ復帰する。
At the same time as the cutting operation, the cutting end of the needle side upper thread I1a is
It is once held by the leaf spring 12 together with the shuttle side lower thread I2a.
However, when the returning operation of the movable blade 8 is completed, the solenoid shaft 18a of the rotary solenoid 18 is moved to the sixth position in synchronization with this.
As the wiper 21 rotates in the direction of the arrow A in the figure and its tip 21a crosses the needle thread path from the picker 16 to the needle N, the needle side needle thread I1a is caught by this wiper tip 21a and pulled out. Be done. As a result, the cut end portion of the needle side upper thread I1a held by the leaf spring 12 is pulled away from the leaf spring 12 by the pulling-out operation of the wiper 21, and becomes an open state as shown by the one-dot chain line in FIG. . Therefore, when the sewn product W is taken out, the needle side upper thread I1a is smoothly removed from the sewn product W. Therefore, when the needle thread is taken out, the upper thread is not unnecessarily paid out from the upper thread supply source, and the next sewing operation is not hindered. After the upper thread I1a is pulled off, the wiper 21 is returned to the initial position by the rotary solenoid 18.

ところで、上記実施例においては、ボビンケース4の前
面に長溝4aを設けて上糸ループI1との非接触部を形成し
たが、この非接触部としては、前記長溝4aに限らず、段
部あるいは貫通孔などによって形成することも可能であ
る。
By the way, in the above embodiment, the long groove 4a is provided on the front surface of the bobbin case 4 to form the non-contact portion with the needle thread loop I1. However, the non-contact portion is not limited to the long groove 4a, but may be a step portion or It can also be formed by a through hole or the like.

また、この考案に係る糸切り装置は、本縫動作を行なう
ミシン、すなわち針とミシン釜との協動により上糸ルー
プと下糸とを結節させて縫い目を形成するミシンであれ
ば適用可能であり、直線的な縫い目を形成するミシンだ
けでなく、千鳥縫いを行なうミシンにも適用可能であ
る。
Further, the thread trimming device according to the present invention can be applied to any sewing machine that performs a lock stitching operation, that is, a sewing machine that forms a stitch by knitting an upper thread loop and a lower thread by the cooperation of a needle and a sewing machine hook. The present invention is applicable not only to sewing machines that form straight stitches, but also to sewing machines that perform zigzag stitches.

[考案の効果] 以上説明したとおり、この考案に係る糸切り装置は、可
動刃の往復動作により上糸及び下糸の捕捉、切断を行う
と共に、前記可動刃の動作に連動して上糸引き出し部材
が往復動し、ボビンケース前面を通過する上糸ループを
捕捉して、ミシン釜の側方へ引き出すようにしたことに
より、切断時において、針から可動刃に至る上糸は、前
記上糸引出し部材にて屈曲し、その経路長が従来の装置
に比べて増加するため、例え、落し切りを行ったとして
も針の上挿通孔から上糸切断端までの長さを十分に維持
することができ、次の縫製において上糸が針から抜脱す
るのを防止できるため、確実に次の縫製動作を行わせる
ことができる。
[Effects of the Invention] As described above, the thread cutting device according to the present invention captures and cuts the upper thread and the lower thread by the reciprocating motion of the movable blade, and draws the upper thread in conjunction with the operation of the movable blade. Since the member reciprocates and catches the upper thread loop passing through the front surface of the bobbin case and pulls it out to the side of the sewing machine hook, the upper thread from the needle to the movable blade at the time of cutting is the upper thread. The length of the path from the upper insertion hole of the needle to the needle thread cutting end should be sufficiently maintained even if the needle is bent because it bends in the drawer member and the path length increases compared to the conventional device. Since the upper thread can be prevented from being pulled out from the needle in the next sewing, the next sewing operation can be reliably performed.

また、上糸引出し部材が、上糸ループの経路長を増加さ
せるため、切断時、可動刃にて捕捉された上糸には張力
が発生し、切断時の切れ味は極めて良好なものとなる。
Further, since the upper thread withdrawing member increases the path length of the upper thread loop, tension is generated in the upper thread captured by the movable blade at the time of cutting, and the sharpness at the time of cutting becomes extremely good.

さらに、この考案に係る糸切り装置は、可動刃の復動動
作終了に同期して、糸払い部材が可動刃から針に至る上
糸経路を横切り同経路に位置する上糸を引き出して上糸
の切断端部を板ばねから引き払うようにしたため、縫製
物の取り出しにおいて、上糸切断端をスムーズに縫製物
から抜脱させることができ、無理なく縫製物を取り出す
ことができると共に、不要な糸が上糸供給源から繰り出
されるのを防止し得るという効果もある。
Further, in the thread trimming device according to the present invention, in synchronization with the completion of the returning operation of the movable blade, the thread wiping member traverses the upper thread path from the movable blade to the needle and pulls out the upper thread located in the same path to draw the upper thread. Since the cutting end of the sewing machine is pulled out from the leaf spring, the needle thread cutting end can be smoothly pulled out from the sewn product when the sewn product is taken out, and the sewn product can be taken out without difficulty and unnecessary There is also an effect that the yarn can be prevented from being paid out from the upper yarn supply source.

【図面の簡単な説明】[Brief description of drawings]

第1図はこの考案の一実施例を示す分解斜視図、第2図
(a)は同実施例における可動刃、固定刃、板ばね及び
ピッカの取付け状態を示す平面図、同図(b)は同図
(a)に示したものの側面図、同図(c)は同図(b)
に示したものの底面図、第3図は同実施例における要部
拡大斜視図、第4図(a)〜(f)は同実施例における
可動刃及びピッカの動作状態を示す説明斜視図、第5図
は同実施例における上糸切断時の状態を示す説明側面
図、第6図は同実施例におけるワイパの動作状態を示す
斜視図である。 図において、 1……ミシン釜 4……ボビンケース 4a……長溝 8……可動刃 8b……刃部 10……固定刃 10a……刃部 16……ピッカ(上糸引出し部材) 16a……糸掛け部 I1……上糸ループ L……針落位置の延長線 21……ワイパ(糸払い部材)
FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 (a) is a plan view showing a mounting state of a movable blade, a fixed blade, a leaf spring and a picker in the same embodiment, and FIG. Is a side view of what is shown in FIG. 4A, and FIG.
FIG. 3 is a bottom view of what is shown in FIG. 3, FIG. 3 is an enlarged perspective view of an essential part in the same embodiment, and FIGS. 4 (a) to 4 (f) are explanatory perspective views showing the operating states of the movable blade and the picker in the same embodiment. FIG. 5 is an explanatory side view showing a state when the upper thread is cut in the same embodiment, and FIG. 6 is a perspective view showing an operating state of the wiper in the same embodiment. In the figure, 1 ... Sewing machine hook 4 ... Bobbin case 4a ... Long groove 8 ... Movable blade 8b ... Blade portion 10 ... Fixed blade 10a ... Blade portion 16 ... Picker (needle thread drawing member) 16a. Thread hooking section I1 …… Upper thread loop L …… Extension line for needle drop position 21 …… Wiper (thread wiper)

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】針板とミシン釜との中間位置に設けられ、
針の落下位置より水平方向に退避させた初期位置から前
記針落位置の延長線を横切る往復経路を移動する可動刃
と、 前記初期位置において前記可動刃の刃部と摺接する刃部
を有する固定刃と、 前記可動刃の一面に接合する板ばねと、を備え、 所定の糸切り指令に応じて前記可動刃を位置往復させる
と共に、本縫いミシンの針及びミシン釜による一縫目形
成動作を行わせることにより、下糸と針板下面に形成さ
める上糸ループとを可動刃にて捕捉させ、両糸を可動刃
と板ばねとの間で切断すると同時に切断した両糸端を可
動刃と板ばねとの間で挟持するようにした本縫いミシン
の糸切り装置において、 前記ミシン釜内に装着されるボビンケースの前面に上糸
ループとの非接触部を形成すると共に、 先端部に前記段部と嵌入可能なフック状の糸掛け部を有
し、前記可動刃の往復動作に連動して前記糸掛け部がミ
シン釜の側方から前記非接触部への嵌入位置に亘って往
復動する上糸引出し部材を設け、 前記ボビンケースの前面を通過する上糸ループを前記非
接触部に嵌入した前記糸掛け部にて捕捉し、捕捉した上
糸ループを糸掛け部の復動によってミシン釜の側方へ引
き出すようにし、かつ、 前記可動刃の復動動作終了に同期して前記可動刃から針
に至る上糸経路を横切るよう移動する糸払い部材を設
け、 前記上糸引き出し部材の糸掛部にて引き出された上糸を
前記糸払い部材によって引き払うようにしたことを特徴
とする本縫いミシンの糸切り装置。
1. An intermediate position between the needle plate and the sewing machine hook,
Fixed with a movable blade that moves in a reciprocating path that crosses an extension line of the needle drop position from an initial position that is horizontally retracted from the drop position of the needle, and a blade portion that is in sliding contact with the blade portion of the movable blade at the initial position A blade and a leaf spring joined to one surface of the movable blade are provided, and the movable blade is reciprocated in position in response to a predetermined thread cutting command, and a stitch forming operation is performed by the needle of the lockstitch sewing machine and the sewing machine hook. By doing this, the lower thread and the upper thread loop formed on the lower surface of the needle plate are caught by the movable blade, and both threads are cut between the movable blade and the leaf spring, and at the same time, the both thread ends cut are set as the movable blade. A thread trimming device for a lockstitch sewing machine that is clamped between a leaf spring and a leaf spring, wherein a non-contact portion with a needle thread loop is formed on the front surface of a bobbin case mounted in the sewing machine hook, and Hook shape that can be inserted into the step An upper thread withdrawing member having a hooking portion, the thread hooking portion reciprocatingly interlocking with the reciprocating movement of the movable blade from a side of the sewing machine hook to a fitting position into the non-contact portion; An upper thread loop passing through the front surface of the case is captured by the thread hooking portion fitted in the non-contact portion, and the captured upper thread loop is pulled out to the side of the sewing machine hook by the return movement of the thread hooking portion, and Provided with a thread wiping member that moves so as to cross an upper thread path from the movable blade to the needle in synchronization with the completion of the returning operation of the movable blade, and the upper thread drawn out by the thread hooking portion of the upper thread drawing member. A thread trimming device for a lockstitch sewing machine, characterized in that the thread is removed by the thread sweeping member.
JP11453789U 1989-09-29 1989-09-29 Thread trimming device for lockstitch sewing machine Expired - Fee Related JPH0727021Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11453789U JPH0727021Y2 (en) 1989-09-29 1989-09-29 Thread trimming device for lockstitch sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11453789U JPH0727021Y2 (en) 1989-09-29 1989-09-29 Thread trimming device for lockstitch sewing machine

Publications (2)

Publication Number Publication Date
JPH0355078U JPH0355078U (en) 1991-05-28
JPH0727021Y2 true JPH0727021Y2 (en) 1995-06-21

Family

ID=31662899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11453789U Expired - Fee Related JPH0727021Y2 (en) 1989-09-29 1989-09-29 Thread trimming device for lockstitch sewing machine

Country Status (1)

Country Link
JP (1) JPH0727021Y2 (en)

Also Published As

Publication number Publication date
JPH0355078U (en) 1991-05-28

Similar Documents

Publication Publication Date Title
JPH10328462A (en) Method for cutting sewing thread by using sewing thread cutting device, and sewing machine for executing the method
JP3318482B2 (en) Method and apparatus for preventing seam fraying
JP2912374B2 (en) Thread trimmer for zigzag sewing machine
JP2006068380A (en) Intermittent stitch sewing machine
JP3499407B2 (en) Method and apparatus for preventing seam fraying
JP3535353B2 (en) Method and apparatus for preventing seam fraying
JP5057303B2 (en) Sewing machine with upper decoration mechanism
JP2010188106A (en) Thread cutter for button sewing machine
JPH0727021Y2 (en) Thread trimming device for lockstitch sewing machine
JP3527835B2 (en) Method and apparatus for preventing seam fraying of double chain stitch sewing machine
US4352333A (en) Sewing machine having thread cutting device
JP2566199Y2 (en) Sewing machine automatic thread trimmer
JP3571576B2 (en) Seam fraying prevention device
JP2008178455A (en) Thread cutter of sewing machine
US3847102A (en) Needle thread wiper and pull-back mechanism for sewing machines
JPH0751177B2 (en) Thread trimming device for lockstitch sewing machine
JP2512639B2 (en) Satin stitch presser
JPH0734838B2 (en) Looper sewing machine bobbin thread gripping device
JP2584981Y2 (en) Sewing machine thread trimmer
JP2961319B2 (en) Embroidery sewing machine thread cutting device
JP2747765B2 (en) Sewing machine thread trimming method and apparatus
JP3254647B2 (en) Sewing machine with automatic thread trimming mechanism
JP4017732B2 (en) sewing machine
JP3714975B2 (en) Thread fall prevention device for rake sewing machine
JP2021027973A (en) Method for stopping fraying of seam and device for stopping fraying of seam

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees